US5905545A - Full-color projection display system using two light modulators - Google Patents

Full-color projection display system using two light modulators Download PDF

Info

Publication number
US5905545A
US5905545A US08/700,329 US70032996A US5905545A US 5905545 A US5905545 A US 5905545A US 70032996 A US70032996 A US 70032996A US 5905545 A US5905545 A US 5905545A
Authority
US
United States
Prior art keywords
light
color
beam
system
modulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/700,329
Inventor
Frank Poradish
James M. Florence
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Texas Instruments Inc
Original Assignee
Texas Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US08/379,391 priority Critical patent/US5612753A/en
Application filed by Texas Instruments Inc filed Critical Texas Instruments Inc
Priority to US08/700,329 priority patent/US5905545A/en
Application granted granted Critical
Publication of US5905545A publication Critical patent/US5905545A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • H04N9/3108Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators by using a single electronic spatial light modulator

Abstract

A full color projection system is disclosed herein. The projection system includes a means for generating a first light beam and also a means for generating a second light beam. These means may include either separate light sources 10a and 10b or a single light source 10 and a means for dividing the light source into the first and second light beams. In two examples, the means for dividing may include either a dichroic color wheel 40 or a color splitting prism 52. When a color splitting prism is used, they prisms are separated by an air gas where the distance of the air gap is determined by the size of spacer balls suspended in an adhesive between the two prisms. The first light beam will be modulated by a first spatial light modulator 30a and the second light beam will be modulated by a second spatial light modulator 30b. These spatial light modulators 30a and 30b are preferably, but not in necessarily digital micromirror devices.

Description

This patent application is a continuation in part of U.S. patent application Ser. No. 08/379,391, filed Jan. 27, 1995, now U.S. Pat. No. 5,612,753.

CROSS-REFERENCE TO RELATED APPLICATIONS

The following patents and/or commonly assigned patent applications are hereby incorporated herein by reference:

______________________________________Patent No. Filing Date                Issue Date TI Case No.______________________________________4,337,759  02/27/81  07/06/82   --5,061,049  09/13/90  10/29/91   TI-13173B5,079,544  02/27/89  01/07/92   TI-139785,083,857  06/29/90  01/28/92   TI-145685,101,236  12/21/89  03/31/92   TI-145855,172,161  12/31/90  12/15/92   TI-156025,339,116  10/15/93  08/16/94   TI-15721A.15,420,524  03/28/94  07/04/95   TI-15602AC08/658,783 06/05/96             TI-18859AAA08/315,997 09/30/94             TI-18734______________________________________
FIELD OF THE INVENTION

This invention generally relates to display and printer systems and specifically to printer and display systems having an architecture which uses two light modulators.

BACKGROUND OF THE INVENTION

Digital micro-mirror devices (also referred to as deformable mirror devices or simply DMDs) are finding many uses in light deflecting technologies. In operation, the devices are akin to small mirrors which rotate about a fixed axis. The rotation causes light to be deflected under control of the rotation. Thus, in an array of DMDs each device, or pixel, can be selectively rotated thereby patterning light reflected from the array.

Digital micro-mirror devices can be used in a wide variety of applications. These applications include displays such as television (e.g., high definition television), computer monitors and other video displays. An example of a video display system is disclosed in U.S. Pat. No. 5,079,544. The DMDs can also be used in printer applications including printers, photocopiers and facsimile machines. An example of a printer system is disclosed in U.S. Pat. No. 5,101,236. Further, DMDs can be used in other applications including video cameras.

A full-color projection display is typically implemented by simultaneously projecting the images of three light modulators, one for each of the primary colors--red, green and blue. If however the light modulator can be addressed fast enough, it is possible to implement a full-color projector with a single modulator and an illumination system that sequentially delivers red, green and blue light to the modulator, such as a rotating color wheel. In this system, the projected color fields are integrated by the eye over the frame time to form the full color image.

Since the digital-micromirror device (DMD) modulator can be addressed fast enough to implement the field sequential system, this method is typically preferred due to the reduced amount of system hardware. However, the single light modulator system can project only about one third of the total lumens to a screen that a three modulator system can. As a result, the range of applications for single modulator systems is limited.

In addition, the field sequential projector has several artifacts that are associated with the different color fields being projected at different times. As an example, these artifacts may cause moving objects on the screen to appear fringed around the end to one looking at the screen. Finally, there are certain lamps that are used for projection systems that do not have proper color balance, i.e., they are deficient in one of the three primary colors. Both single modulator and three modulator systems must sacrifice some of the total brightness in order to color balance a system using this type of lamp.

SUMMARY OF THE INVENTION

A full color projection system is disclosed herein. The projection system includes a means for generating a first light beam and also a means for generating a second light beam. These means may include either separate light sources or a single light source and a means for dividing the light source into the first and second light beams. In two examples, the means for dividing may include either a dichroic color wheel or a color splitting prism. The first light beam will be modulated by a first spatial light modulator while the second light beam will be modulated by a second spatial light modulator. These spatial light modulators are preferably, but not necessarily, digital micromirror devices. When a color splitting prism is used, the prisms are separated by a prescribed distance, and the distance is controlled by the size of spacer balls that are suspended in the adhesive between prisms.

The invention provides increased brightness since twice as many lumens can be projected within the full color image. In addition, the system may be designed so as to minimize or reduce the field sequential color separation artifacts. Continuous projection of all colors (i.e. 3-modulator systems) eliminates color separation artifacts. In a two-modulator system the most offending color (typically red) can be displayed continuously while the other two colors can be sequenced faster due to the additional timeline available relative to a single chip system (i.e. 50% per color vs 33% per color) or (66% per color vs 33% per color). In addition, the system may be designed so as to reduce gray level contouring artifacts or extend the projected number of gray levels.

DESCRIPTION OF THE DRAWINGS

The above features of the present invention will be more dearly understood from consideration of the following descriptions in connection with accompanying drawings in which:

FIGS. 1, 2, 2a and 3 provide three embodiments for a color projection system of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

The making and use of various embodiments are discussed below in detail. However, it should be appreciated that the present invention provides many applicable inventive concepts which can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not delimit the scope of the invention.

The systems presented herein implement a full color display system using two light modulators. These systems achieve the result of approximately doubling the total projected lumens. In one aspect, the present invention provides a display system which includes means for generating a first and second light beams and two spatial light modulators for receiving these light beams and directed a modulated version of the light to a screen. Each of FIGS. 1, 2 and 3 illustrate specific examples of embodiments which utilize this basic concept. It should be understood, however, that other systems utilizing two spatial light modulators could also be utilized.

The conceptually simplest of the embodiments includes two single modulator systems 5a and 5b which operate simultaneously and converge the projected images. This solution is illustrated in FIG. 1. Referring now to FIG. 1, first and second light sources 10 and 12 are provided. The first light source 10a (e.g., a xenon arc lamp) generates a light beam (illustrated by the light path 14a) which will reflect off of mirror 16a (e.g., a cold mirror) toward lens system 18a. A heat sink 36a may be utilized to prevent the mirror 16a from over heating. The lens system 18a must comprise an achromats (air-space) with two 100 mm focal length lens.

The lens system 18a will focus the light beam on color wheel 20a. The color wheel 20a may comprise any diameter color wheel that will fit in the system. As an example, a six inch color wheel 20a may be used. The color wheel 20 will be rotated by color wheel motor 22a. As is known in the art, color wheel 20a may be segmented such that different portions of the color wheel 20a will transmit different color lights. For example, the color wheel 20a may comprise three equal size sections where the first section will pass red light, the second section will pass blue light, and the third section will pass green light.

Light from the color wheel 20a will be directed to lens system 24a which may comprise an achromats (cemented) with two 100 mm focal length lens. The light from lens system 24a may then be directed to mirror 26a (e.g., cold mirror) and then to total internal reflection (TIR) prism 28a.

The TIR prism 28a is designed so as to reflect the light coming from mirror 26a to spatial light modulator 30a via total internal reflection due to the air gap created by the spacer balls 27a and 27b of FIG. 2a suspended in the adhesive 29 between the two prisms. The spatial light modulator 30a will modulate the light and direct it back to total internal reflection prism 28a which will then transmit the light through the air gap to lens 32a. The lens 32a may then project the light to a screen 34. In this context, screen 34 may comprise any item or region within the system which requires the projected image. In the preferred embodiment, the lens 32a may comprise a 28 mm fixed f/2.8 lens or a 20-70 mm zoom f/3.5 SLR camera lens.

In the preferred embodiment, the spatial light modulator 30a (as well as 30b) comprises a digital micromirror device (DMD). Examples of digital micromirror devices are provided in U.S. Pat. No. 5,061,049 issued Oct. 29, 1991 and U.S. Pat. No. 5,083,857 issued Jan. 28, 1992, both of which are incorporated herein by reference. Any of the variations of DMD devices described in these patents may be used in the present system. For the sake of simplicity, description of these devices will not be repeated herein. Reference may be made to the cited patents for the details of the DMD 30a.

The image projected from the second spatial light modulator device 30b is generated from a system 5b similar to the system 5a just described. This image is generated from the light source 10b which directs a beam to mirror 16b which in turn redirects the beam to lens system 18b. The lens 18b focuses the light on color wheel 20b which then transmits the light to lens system 24b. The lens 24b transmits the light to cold mirror 26b which redirects the light to TIR prism 28b and then to spatial light modulator 30b. The spatial light modulator 30b modulates the light and directs it through the TIR prism 28b to lens 32b. As before, the color wheel 20b may be rotated by means of color wheel motor 22b and IR stop/heat sink 36b may be utilized to prevent overheating of mirror 16b.

The system illustrated in FIG. 1 can be run with both single modulator projectors 5a and 5b completely synchronized, for example, by computer control. That is, both projectors 5a and 5b may project the same frequency of red, green and blue color fields thereby doubling the total projected lumens. By running the systems with synchronized but offset color fields, that is, for example, one system running red, green and blue, while the other runs green, blue and red, the total projected lumens are again doubled but the field sequential color separation arifacts will be reduced due to the presence of two different color fields on the screen simultaneously. If offset color fields are utilized, the color wheels 20a and 20b (along with motors 22a and 22b) can be replaced with a single color wheel (not shown). This implementation will reduce the amount of hardware required.

Either of these implementations may also be able to alleviate the gray level contouring artifacts or extend the number of projected gray levels by using separate bit splitting techniques at the two modulators 30a and 30b. Techniques for bit splitting are described in U.S. Pat. No. 5,339,116 and co-pending applications 08/275,057, 08/176,618, 08/177,013, 08/264,387, and 08/280,032, each of which is incorporated herein by reference.

The system shown in FIG. 1 has twice as much hardware as a single modulator system, including two lamps 10a and 10b, possibly two color wheels 20a and 20b, and two completely separate illumination and projection systems (including DMDs 30a and 30b). The system shown in FIG. 2 is an alternate embodiment that reduces the need for separate lamps and color wheels and reduces the amount of illumination hardware in the system.

Referring to the specific embodiment illustrated in FIG. 2, light source 10 generates a light beam (illustrated on path 14) which is directed to (cold) mirror 16. The IR step stop/heat sink 36 is provided to prevent the mirror 16 from becoming too hot. The light beam 14 is reflected from mirror 16 towards lens 18 wherein it is focused on color wheel 40.

A first light beam 42 is transmitted through the color wheel 40 to lens system 24a wherein it is subsequently reflected from mirror 26a to TIR prism 28a and then to spatial light modulator 30a. A second light beam 44 is reflected from color wheel 40 to spherial reflector 46 and then back to another portion of color wheel 40. The second light beam is then transmitted to lens 24b which focuses the second light beam 44 on mirror 26b. The light beam is then directed to TIR prism 28b and then to the spatial light modulator 30b.

In this arrangement, light from the lamp 10 is focused onto a dichroic color wheel 40 which transmits a primary color (red, green, or blue) while reflecting the complimentary colors (cyan, magenta or yellow). The reflected light from color wheel 40 is reimaged back onto the color wheel 40 at a spot that passes one of the other primary colors. For example, the light is reimaged at a point 120° ahead of the first focus spot on the wheel 40. This illumination system provides two separate illumination paths, one with a sequence of red, green then blue illumination and the second with green, blue and then red illumination.

Since there does not appear to be a simple way of recombining the two images from the modulators 30a and 30b, separate projection lens 32a and 32b are recommended (but not required).

The embodiment represented by FIG. 2 produces the same increase in projected lumens as the system of FIG. 1 but uses only a single lamp 10 and color wheel 40. The system uses offset color fields that will provide an alleviation from a field sequential color separation artifacts, and the same potential for suppression of gray level contouring artifacts.

The system shown in FIG. 3 is another embodiment that further reduces the amount of system hardware needed for a two modulator projector. In this system, a single lamp 10 (e.g., a metal halide arc lamp) is focused to a color wheel 50 that always passes one of the primary colors, and alternates between the other two. For example, if the wheel 50 always passes red and alternates between green and blue, the wheel 50 would be made of yellow and magenta segments (since red and green combine for yellow and red and blue combine for magenta). The light passing the color wheel 50 is relayed through a color splitting prism 52 that passes the dominant color (red in the example) to one modulator 30a and the other colors to the second modulator 30b. The color splitting prism 52 also recombines the color fields when a reflective modulator is used. As indicated in the figure, for a reflective modulator, a TIR prism 28 is also used in the illumination path to provide the proper illumination angle and to allow the precombined color fields to be imaged by a single projection lens 32.

The TIR prism relies on a uniformly thin air gas which is typically created with small (approximately 10 micron) spacer balls such as 27a and 27b shown in FIG. 2a. The spacer balls are suspended in the adhesive 29 of FIG. 2a that holds the two prisms together. Similar air gaps may be used in the color splitting prism as well to facilitate coating design and prism assembly.

In this system, the dominant color will be three times brighter than in a standard single modulator system, since it is projected for the complete frame rather than only one-third of the frame. The other two colors are 50% (i.e., one and a half times) brighter since they will be projected for half the frame rather than one-third of the frame. Thus, if the lamp 60 is uniformly color balanced to begin with, attenuation of the dominant color path by 50% will produce a uniform color balance with a total projected lumen output 50% higher than a single modulator system.

This embodiment is particularly attractive when the lamp 10 has a color imbalance caused by deficient output of one of the three primary colors. For example, consider a lamp 10 that has only half the red output as needed for proper color balance. The system described here with no attenuation in the right channel will boost the red output relative to the green and blue to the point of proper color balance. This will provide a system that is approximately 3 times as bright as a color balanced single modulator system and equal in brightness to a color balanced three modulator system.

In the specific embodiment of FIG. 3, light source 10 generates a beam of light which is directed to (cold) mirror 16. Once again heat sink 36 may be provided to prevent the mirror 16 from becoming too hot. The light is reflected from mirror 16 to lens 18 whereafter it is focused upon color wheel 50. The color wheel 50 may be driven by color wheel motor 22. The light from color wheel 50 is directed to lens 24 whereby it is focused upon mirror 26. The light from mirror 26 is directed to TIR prism 28 whereafter it is directed through color splitting prisms 52 to either spatial light modulator 30a or spatial light modulator 30b. As previously discussed, the spatial light modulators 30a and 30b may comprise digital micromirror devices. The modulated light from spatial light modulators 30a and 30b is directed back through color splitting prism 52 through TIR prism 28 to projection lens 32 which may project the image to a screen (not illustrated in FIG. 3).

While this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to the description. It is therefore intended that the appended claims encompass any such modifications or embodiments.

Claims (6)

What is claimed is:
1. A full-color projection system comprising:
a single light source which generates a single beam of light; and
a color-splitting prism for dividing said single beam of light into first and second light beams wherein the prism has an air gap in which are a plurality of spacer balls suspended in an adhesive;
a first spatial light modulator for receiving said first light beam and redirecting a modulated version of said first light beam to a screen; and
a second spatial light modulator for receiving said second light beam and redirecting a modulated version of said second light beam to said screen.
2. The system of claim 1 wherein said first and second spatial light modulators comprise digital micro-mirror devices.
3. A fill color projection system comprising:
a light source for generating a beam of light;
a color wheel for receiving said beam of light and passing a filtered light beam;
a color splitting prism for directing a first portion of said filtered light beam to a first spatial light modulator and a second portion of said filtered light beam to a second spatial light modulator, wherein said prism includes an air gap in which are spacer balls suspended in an adhesive; and
a screen for receiving modulated light from both said first and second spatial light modulators.
4. The system of claim 3 wherein said color wheel passes light of one primary color all the time and light of the other primary colors half of the time, wherein the primary colors consist of red, green and blue.
5. The system of claim 4 wherein said color wheel comprises first and second segments, said first segment for passing magenta colored light and said second segment for passing yellow colored light.
6. The system of claim 3 and further comprising a total internal reflection prism positioned between said color splitting prism and said screen.
US08/700,329 1995-01-27 1996-08-08 Full-color projection display system using two light modulators Expired - Lifetime US5905545A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/379,391 US5612753A (en) 1995-01-27 1995-01-27 Full-color projection display system using two light modulators
US08/700,329 US5905545A (en) 1995-01-27 1996-08-08 Full-color projection display system using two light modulators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/700,329 US5905545A (en) 1995-01-27 1996-08-08 Full-color projection display system using two light modulators

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08/379,391 Continuation-In-Part US5612753A (en) 1995-01-27 1995-01-27 Full-color projection display system using two light modulators

Publications (1)

Publication Number Publication Date
US5905545A true US5905545A (en) 1999-05-18

Family

ID=46253113

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/700,329 Expired - Lifetime US5905545A (en) 1995-01-27 1996-08-08 Full-color projection display system using two light modulators

Country Status (1)

Country Link
US (1) US5905545A (en)

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6129437A (en) * 1996-12-26 2000-10-10 Plus Corporation Image display apparatus
US6155687A (en) * 1999-07-16 2000-12-05 Infocus Corporation Light guide for use in a color wheel display synchronization apparatus and method
US6179424B1 (en) 1999-01-18 2001-01-30 Minolta Co., Ltd. Optical system for a projector
US6249387B1 (en) * 1998-05-13 2001-06-19 Texas Instruments Incorporated Stable enhanced contrast optical system for high resolution displays
WO2001090814A2 (en) * 2000-05-24 2001-11-29 Ball Semiconductor, Inc. Maskless exposure system
US6357878B1 (en) 1999-01-18 2002-03-19 Minolta Co., Ltd. Optical system for a projector
US6359662B1 (en) * 1999-11-05 2002-03-19 Agilent Technologies, Inc. Method and system for compensating for defects in a multi-light valve display system
US6382799B1 (en) 1999-07-27 2002-05-07 Minolta Co., Ltd. Projection optical apparatus
US6433917B1 (en) 2000-11-22 2002-08-13 Ball Semiconductor, Inc. Light modulation device and system
US20020118310A1 (en) * 2001-02-26 2002-08-29 Delong James Andrew Projection system with folded optical path
US6454417B1 (en) 1999-03-05 2002-09-24 Minolta Co., Ltd. Projection optical system comprising an optical function surface for reflecting or transmitting light from a spatial light modulator
US6473237B2 (en) 2000-11-14 2002-10-29 Ball Semiconductor, Inc. Point array maskless lithography
US6493867B1 (en) 2000-08-08 2002-12-10 Ball Semiconductor, Inc. Digital photolithography system for making smooth diagonal components
US6509955B2 (en) 2000-05-25 2003-01-21 Ball Semiconductor, Inc. Lens system for maskless photolithography
US6512625B2 (en) 2000-11-22 2003-01-28 Ball Semiconductor, Inc. Light modulation device and system
US20030025979A1 (en) * 2001-07-31 2003-02-06 Ball Semiconductor, Inc. Surface distortion compensated photolithography
US6529262B1 (en) 1999-04-14 2003-03-04 Ball Semiconductor, Inc. System and method for performing lithography on a substrate
US6537738B1 (en) 2000-08-08 2003-03-25 Ball Semiconductor, Inc. System and method for making smooth diagonal components with a digital photolithography system
US6547399B2 (en) * 1999-01-28 2003-04-15 Duke University Image engine having multiple image sources with different response times for color operation
US6556256B1 (en) * 1999-03-02 2003-04-29 Seiko Epson Corporation Projector and prism used therein
US6580469B1 (en) * 1997-04-28 2003-06-17 Carl Zeiss Jena Gmbh Projection device
US6616280B2 (en) * 2001-03-28 2003-09-09 Fuji Photo Optical Co., Ltd. Projection type image display apparatus using reflection type liquid crystal display device
EP1133712B1 (en) * 1999-09-29 2003-12-03 Philips Electronics N.V. Image projection system
US20030227677A1 (en) * 2002-06-11 2003-12-11 Doherty Donald B. Display system with clock-dropping to compensate for lamp variations and for phase locking of free-running sequencer
US20030233528A1 (en) * 2002-06-14 2003-12-18 Ball Semiconductor, Inc. Modified photolithography movement system
US20030234911A1 (en) * 2002-06-21 2003-12-25 Eastman Kodak Company Imaging apparatus for increased color gamut using dual spatial light modulators
US6671005B1 (en) * 1999-06-21 2003-12-30 Altman Stage Lighting Company Digital micromirror stage lighting system
US20040004699A1 (en) * 2002-04-23 2004-01-08 Ball Semiconductor, Inc. High resolution point array
US6704145B1 (en) 2002-09-04 2004-03-09 Raytheon Company Air-gap optical structure having the air gap defined by a layered spacer structure
US6717749B2 (en) * 2001-11-01 2004-04-06 Pentax Corporation Cemented lens group
US20040070736A1 (en) * 2002-10-11 2004-04-15 Eastman Kodak Company Six color display apparatus having increased color gamut
US20040160198A1 (en) * 1997-05-12 2004-08-19 Light And Sound Design, Ltd. A England Corporation Electronically controlled stage lighting system
US20040218292A1 (en) * 2001-08-03 2004-11-04 Huibers Andrew G Micromirror array for projection TV
US20040218154A1 (en) * 2000-08-30 2004-11-04 Huibers Andrew G. Packaged micromirror array for a projection display
US20050013142A1 (en) * 2002-05-03 2005-01-20 Andersen Odd Ragnar Multi-lamp arrangement for optical systems
US6847479B1 (en) 2001-02-02 2005-01-25 Cheetah Omni, Llc Variable blazed grating
US20050073737A1 (en) * 2000-08-01 2005-04-07 Cheetah Omni, Inc., A Texas Limited Liability Company Micromechanical optical switch
US20050105061A1 (en) * 2001-03-15 2005-05-19 Delong James A. Projection system with folded optical path
US6900919B1 (en) 2001-02-02 2005-05-31 Cheetah Omni, Llc Variable blazed grating
US20050179982A1 (en) * 2000-12-07 2005-08-18 Patel Satyadev R. Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
EP1589751A1 (en) * 2004-04-19 2005-10-26 Sony Deutschland GmbH Modular projector arrangement for stereoscopy using a single light source with time-sequential colour selection
US20050237495A1 (en) * 2004-04-23 2005-10-27 Peterson Mark D Method and apparatus for arranging light emitting devices in projection systems
US6961194B2 (en) * 2001-12-31 2005-11-01 Texas Instruments Incorporated Integrated TIR prism and lens element
US6962419B2 (en) 1998-09-24 2005-11-08 Reflectivity, Inc Micromirror elements, package for the micromirror elements, and projection system therefor
US20060007522A1 (en) * 2003-10-30 2006-01-12 Andrew Huibers Micromirror and post arrangements on substrates
US20060132899A1 (en) * 2000-08-01 2006-06-22 Islam Mohammed N Micromechanical optical switch
US7116862B1 (en) 2000-12-22 2006-10-03 Cheetah Omni, Llc Apparatus and method for providing gain equalization
US20070024529A1 (en) * 2000-06-07 2007-02-01 Ilan Ben-David Device, system and method for electronic true color display
US20070101398A1 (en) * 2005-11-01 2007-05-03 Cheetah Omni, Llc Packet-Based Digital Display System
US20070126996A1 (en) * 2003-05-14 2007-06-07 Coates Nicholas R Image display apparatus
US20070146640A1 (en) * 2005-05-03 2007-06-28 Silverstein Barry D Display apparatus using lcd panel
US7339714B1 (en) 2001-02-02 2008-03-04 Cheetah Omni, Llc Variable blazed grating based signal processing
US7505208B1 (en) 2006-02-06 2009-03-17 Raytheon Company Air-gap optical structure with a nonreflective air-gap spacer
WO2010096066A1 (en) * 2008-03-11 2010-08-26 Robe Lighting Inc An integrated multiple output luminaire
TWI397888B (en) * 2005-01-10 2013-06-01 Ibm Method and apparatus for miniaturizing digital light processing displays using high refractive index crystals
JP2015533225A (en) * 2012-09-28 2015-11-19 深▲ちぇん▼市繹立鋭光科技開発有限公司 Light source system and associated projection system
US20160119595A1 (en) * 2014-10-27 2016-04-28 Texas Instruments Incorporated Color Recapture using Polarization Recovery in a Color-Field Sequential Display System
TWI584049B (en) * 2015-07-20 2017-05-21 深圳市光峰光電技術有限公司 Light combining control system
US9664989B2 (en) 2013-05-23 2017-05-30 Texas Instruments Incorporated Multi-spatial light modulator image display projector architectures using solid state light sources
TWI587066B (en) * 2016-07-05 2017-06-11 台達電子工業股份有限公司 Optical device
WO2017117035A1 (en) 2015-12-29 2017-07-06 3M Innovative Properties Company Additive manufacturing methods for adhesives and adhesive articles
CN107688273A (en) * 2016-08-06 2018-02-13 深圳市光峰光电技术有限公司 Display system and image modulation method
US20180196335A1 (en) * 2015-07-17 2018-07-12 Nec Display Solutions, Ltd. Image display device and image display method
US10110861B2 (en) 2014-04-02 2018-10-23 Appotronics Corporation Limited Light source system and projection system
EP1584199B1 (en) * 2002-10-24 2019-07-03 Infitec GmbH Stereo projection device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422376A (en) * 1943-11-27 1947-06-17 Bausch & Lomb Light beam divider
US2809570A (en) * 1953-04-07 1957-10-15 Technicolor Corp Optical system for relating color component images
US4415233A (en) * 1981-02-05 1983-11-15 Canon Kabushiki Kaisha Achromatized beam splitter of low polarization
US4687301A (en) * 1985-07-12 1987-08-18 Hughes Aircraft Company Full-color projector system with a tricolor-separating prism
US5612753A (en) * 1995-01-27 1997-03-18 Texas Instruments Incorporated Full-color projection display system using two light modulators
US5689314A (en) * 1995-06-14 1997-11-18 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Common path point diffraction interferometer using liquid crystal phase shifting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422376A (en) * 1943-11-27 1947-06-17 Bausch & Lomb Light beam divider
US2809570A (en) * 1953-04-07 1957-10-15 Technicolor Corp Optical system for relating color component images
US4415233A (en) * 1981-02-05 1983-11-15 Canon Kabushiki Kaisha Achromatized beam splitter of low polarization
US4687301A (en) * 1985-07-12 1987-08-18 Hughes Aircraft Company Full-color projector system with a tricolor-separating prism
US5612753A (en) * 1995-01-27 1997-03-18 Texas Instruments Incorporated Full-color projection display system using two light modulators
US5689314A (en) * 1995-06-14 1997-11-18 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Common path point diffraction interferometer using liquid crystal phase shifting

Cited By (144)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6129437A (en) * 1996-12-26 2000-10-10 Plus Corporation Image display apparatus
US6580469B1 (en) * 1997-04-28 2003-06-17 Carl Zeiss Jena Gmbh Projection device
US7379230B2 (en) * 1997-05-12 2008-05-27 Production Resource Group, L.L.C. Electronically controlled stage lighting system
US7643204B2 (en) 1997-05-12 2010-01-05 Production Resource Group, Llc Electronically controlled stage lighting system
US20040160198A1 (en) * 1997-05-12 2004-08-19 Light And Sound Design, Ltd. A England Corporation Electronically controlled stage lighting system
US20060187532A1 (en) * 1997-05-12 2006-08-24 William Hewlett Electronically controlled stage lighting system
US20100110520A1 (en) * 1997-05-12 2010-05-06 Production Resource Group L.L.C Electronically Controlled Stage Lighting System
US20110121737A1 (en) * 1997-05-12 2011-05-26 Light And Sound Design Ltd. Electronically Controlled Stage Lighting System
US8300302B2 (en) 1997-05-12 2012-10-30 Production Resource Group, Llc Electronically controlled stage lighting system
US7880957B2 (en) 1997-05-12 2011-02-01 Production Resource Group, L.L.C. Electronically controlled stage lighting system
US7230752B2 (en) * 1997-05-12 2007-06-12 Production Resource Group, L.L.C. Electronically controlled stage lighting system
US9036245B2 (en) 1997-05-12 2015-05-19 Production Resource Group, Llc Electronically controlled stage lighting system
US6249387B1 (en) * 1998-05-13 2001-06-19 Texas Instruments Incorporated Stable enhanced contrast optical system for high resolution displays
US6962419B2 (en) 1998-09-24 2005-11-08 Reflectivity, Inc Micromirror elements, package for the micromirror elements, and projection system therefor
US6179424B1 (en) 1999-01-18 2001-01-30 Minolta Co., Ltd. Optical system for a projector
US6357878B1 (en) 1999-01-18 2002-03-19 Minolta Co., Ltd. Optical system for a projector
US6547399B2 (en) * 1999-01-28 2003-04-15 Duke University Image engine having multiple image sources with different response times for color operation
US6556256B1 (en) * 1999-03-02 2003-04-29 Seiko Epson Corporation Projector and prism used therein
US6454417B1 (en) 1999-03-05 2002-09-24 Minolta Co., Ltd. Projection optical system comprising an optical function surface for reflecting or transmitting light from a spatial light modulator
US6529262B1 (en) 1999-04-14 2003-03-04 Ball Semiconductor, Inc. System and method for performing lithography on a substrate
US6671005B1 (en) * 1999-06-21 2003-12-30 Altman Stage Lighting Company Digital micromirror stage lighting system
US6155687A (en) * 1999-07-16 2000-12-05 Infocus Corporation Light guide for use in a color wheel display synchronization apparatus and method
US6382799B1 (en) 1999-07-27 2002-05-07 Minolta Co., Ltd. Projection optical apparatus
EP1133712B1 (en) * 1999-09-29 2003-12-03 Philips Electronics N.V. Image projection system
US6359662B1 (en) * 1999-11-05 2002-03-19 Agilent Technologies, Inc. Method and system for compensating for defects in a multi-light valve display system
WO2001090814A2 (en) * 2000-05-24 2001-11-29 Ball Semiconductor, Inc. Maskless exposure system
US6425669B1 (en) * 2000-05-24 2002-07-30 Ball Semiconductor, Inc. Maskless exposure system
WO2001090814A3 (en) * 2000-05-24 2002-03-21 Ball Semiconductor Inc Maskless exposure system
US6509955B2 (en) 2000-05-25 2003-01-21 Ball Semiconductor, Inc. Lens system for maskless photolithography
US20070024529A1 (en) * 2000-06-07 2007-02-01 Ilan Ben-David Device, system and method for electronic true color display
US20060132899A1 (en) * 2000-08-01 2006-06-22 Islam Mohammed N Micromechanical optical switch
US20050275932A1 (en) * 2000-08-01 2005-12-15 Islam Mohammed N Micromechanical optical switch
US20050073737A1 (en) * 2000-08-01 2005-04-07 Cheetah Omni, Inc., A Texas Limited Liability Company Micromechanical optical switch
US7142347B2 (en) 2000-08-01 2006-11-28 Cheetah Omni, Llc Method and system for processing photonic systems using semiconductor devices
US6950225B2 (en) 2000-08-01 2005-09-27 Cheetah Omni, Llc Micromechanical optical switch
US6493867B1 (en) 2000-08-08 2002-12-10 Ball Semiconductor, Inc. Digital photolithography system for making smooth diagonal components
US6537738B1 (en) 2000-08-08 2003-03-25 Ball Semiconductor, Inc. System and method for making smooth diagonal components with a digital photolithography system
US20040218149A1 (en) * 2000-08-30 2004-11-04 Huibers Andrew G. Projection display
US20050030490A1 (en) * 2000-08-30 2005-02-10 Huibers Andrew G. Projection display
US20040233392A1 (en) * 2000-08-30 2004-11-25 Huibers Andrew G. Projection TV with improved micromirror array
US20040218293A1 (en) * 2000-08-30 2004-11-04 Huibers Andrew G. Packaged micromirror array for a projection display
US20040223088A1 (en) * 2000-08-30 2004-11-11 Huibers Andrew G. Projection TV with improved micromirror array
US20040218154A1 (en) * 2000-08-30 2004-11-04 Huibers Andrew G. Packaged micromirror array for a projection display
US6473237B2 (en) 2000-11-14 2002-10-29 Ball Semiconductor, Inc. Point array maskless lithography
US6433917B1 (en) 2000-11-22 2002-08-13 Ball Semiconductor, Inc. Light modulation device and system
US6512625B2 (en) 2000-11-22 2003-01-28 Ball Semiconductor, Inc. Light modulation device and system
US20050191790A1 (en) * 2000-12-07 2005-09-01 Patel Satyadev R. Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US7671428B2 (en) 2000-12-07 2010-03-02 Texas Instruments Incorporated Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US20050181532A1 (en) * 2000-12-07 2005-08-18 Patel Satyadev R. Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US20050180686A1 (en) * 2000-12-07 2005-08-18 Patel Satyadev R. Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US20050214976A1 (en) * 2000-12-07 2005-09-29 Patel Satyadev R Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US20070001247A1 (en) * 2000-12-07 2007-01-04 Patel Satyadev R Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US7655492B2 (en) 2000-12-07 2010-02-02 Texas Instruments Incorporated Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US20050179982A1 (en) * 2000-12-07 2005-08-18 Patel Satyadev R. Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US20050260793A1 (en) * 2000-12-07 2005-11-24 Patel Satyadev R Methods for depositing, releasing and packaging micro-electromechanical devices on wafer substrates
US7116862B1 (en) 2000-12-22 2006-10-03 Cheetah Omni, Llc Apparatus and method for providing gain equalization
US6847479B1 (en) 2001-02-02 2005-01-25 Cheetah Omni, Llc Variable blazed grating
US7339714B1 (en) 2001-02-02 2008-03-04 Cheetah Omni, Llc Variable blazed grating based signal processing
US20050099692A1 (en) * 2001-02-02 2005-05-12 Cheetah Omni, Inc., A Texas Limited Liability Company Variable blazed grating
US6900919B1 (en) 2001-02-02 2005-05-31 Cheetah Omni, Llc Variable blazed grating
US6972886B2 (en) 2001-02-02 2005-12-06 Cheetah Omni, Llc Variable blazed grating
US20020118310A1 (en) * 2001-02-26 2002-08-29 Delong James Andrew Projection system with folded optical path
US6859239B2 (en) * 2001-02-26 2005-02-22 Infocus Corporation Projection system with folded optical path
US20050105061A1 (en) * 2001-03-15 2005-05-19 Delong James A. Projection system with folded optical path
US6616280B2 (en) * 2001-03-28 2003-09-09 Fuji Photo Optical Co., Ltd. Projection type image display apparatus using reflection type liquid crystal display device
US20030025979A1 (en) * 2001-07-31 2003-02-06 Ball Semiconductor, Inc. Surface distortion compensated photolithography
US20040218292A1 (en) * 2001-08-03 2004-11-04 Huibers Andrew G Micromirror array for projection TV
US6717749B2 (en) * 2001-11-01 2004-04-06 Pentax Corporation Cemented lens group
US7817341B2 (en) 2001-12-31 2010-10-19 Texas Instruments Incorporated Integrated TIR prism and lens element
US6961194B2 (en) * 2001-12-31 2005-11-01 Texas Instruments Incorporated Integrated TIR prism and lens element
US20090128881A1 (en) * 2001-12-31 2009-05-21 Texas Instruments Incorporated Integrated TIR Prism and Lens Element
US20060061892A1 (en) * 2001-12-31 2006-03-23 Texas Instruments Inc. Integrated TIR prism and lens element
US7483216B2 (en) 2001-12-31 2009-01-27 Texas Instruments Incorporated Integrated TIR prism and lens element
US20040004699A1 (en) * 2002-04-23 2004-01-08 Ball Semiconductor, Inc. High resolution point array
US6870604B2 (en) * 2002-04-23 2005-03-22 Ball Semiconductor, Inc. High resolution point array
USRE43959E1 (en) * 2002-05-03 2013-02-05 Projectiondesign As Multi-lamp arrangement for optical systems
US7033056B2 (en) 2002-05-03 2006-04-25 Projectiondesign As Multi-lamp arrangement for optical systems
US7284889B2 (en) 2002-05-03 2007-10-23 Projectiondesign As Multi-lamp arrangement for optical systems
US20050013142A1 (en) * 2002-05-03 2005-01-20 Andersen Odd Ragnar Multi-lamp arrangement for optical systems
US20060061981A1 (en) * 2002-05-03 2006-03-23 Projectiondesign As Multi-lamp arrangement for optical systems
US20030227677A1 (en) * 2002-06-11 2003-12-11 Doherty Donald B. Display system with clock-dropping to compensate for lamp variations and for phase locking of free-running sequencer
US7233427B2 (en) 2002-06-11 2007-06-19 Texas Instruments Incorporated Display system with clock dropping
US20060187519A1 (en) * 2002-06-11 2006-08-24 Doherty Donald B Display system with clock-dropping to compensate for lamp variations and for phase locking of free-running sequencer
US7019881B2 (en) 2002-06-11 2006-03-28 Texas Instruments Incorporated Display system with clock dropping
US7405856B2 (en) 2002-06-11 2008-07-29 Texas Instruments Incorporated Display system timing control method
US20070236770A1 (en) * 2002-06-11 2007-10-11 Texas Instruments Incorporated Display System with Clock-Dropping to Compensate for Lamp Variations and for Phase Locking of Free Running Sequencer
US7164961B2 (en) 2002-06-14 2007-01-16 Disco Corporation Modified photolithography movement system
US20030233528A1 (en) * 2002-06-14 2003-12-18 Ball Semiconductor, Inc. Modified photolithography movement system
US6736514B2 (en) 2002-06-21 2004-05-18 Eastman Kodak Company Imaging apparatus for increased color gamut using dual spatial light modulators
US20030234911A1 (en) * 2002-06-21 2003-12-25 Eastman Kodak Company Imaging apparatus for increased color gamut using dual spatial light modulators
US6704145B1 (en) 2002-09-04 2004-03-09 Raytheon Company Air-gap optical structure having the air gap defined by a layered spacer structure
US6863402B2 (en) 2002-10-11 2005-03-08 Eastman Kodak Company Apparatus for displaying a color image from digital data
US20040207821A1 (en) * 2002-10-11 2004-10-21 Roddy James E. Apparatus for displaying a color image from digital data
US20040207820A1 (en) * 2002-10-11 2004-10-21 Roddy James E. Apparatus for displaying a color image from digital data
US6769772B2 (en) 2002-10-11 2004-08-03 Eastman Kodak Company Six color display apparatus having increased color gamut
US6857748B2 (en) 2002-10-11 2005-02-22 Eastman Kodak Company Apparatus for displaying a color image from digital data
US20040070736A1 (en) * 2002-10-11 2004-04-15 Eastman Kodak Company Six color display apparatus having increased color gamut
EP1584199B1 (en) * 2002-10-24 2019-07-03 Infitec GmbH Stereo projection device
US7517095B2 (en) * 2003-05-14 2009-04-14 Seos Limited Image display apparatus
US20070126996A1 (en) * 2003-05-14 2007-06-07 Coates Nicholas R Image display apparatus
US20060007522A1 (en) * 2003-10-30 2006-01-12 Andrew Huibers Micromirror and post arrangements on substrates
US20060018003A1 (en) * 2003-10-30 2006-01-26 Andrew Huibers Micromirror and post arrangements on substrates
EP1589751A1 (en) * 2004-04-19 2005-10-26 Sony Deutschland GmbH Modular projector arrangement for stereoscopy using a single light source with time-sequential colour selection
US20080192152A1 (en) * 2004-04-19 2008-08-14 Sony Deutschland Gmbh Projector Arrangement
US8144188B2 (en) 2004-04-19 2012-03-27 Sony Deutschland Gmbh Projector arrangement
WO2005101821A1 (en) * 2004-04-19 2005-10-27 Sony Deutschland Gmbh Projector arrangement
US7168810B2 (en) * 2004-04-23 2007-01-30 Infocus Corporation Method and apparatus for arranging light emitting devices in projection systems
US20050237495A1 (en) * 2004-04-23 2005-10-27 Peterson Mark D Method and apparatus for arranging light emitting devices in projection systems
TWI397888B (en) * 2005-01-10 2013-06-01 Ibm Method and apparatus for miniaturizing digital light processing displays using high refractive index crystals
US20070146640A1 (en) * 2005-05-03 2007-06-28 Silverstein Barry D Display apparatus using lcd panel
US7334897B2 (en) * 2005-05-03 2008-02-26 Eastman Kodak Company Display apparatus using LCD Panel
US20070101398A1 (en) * 2005-11-01 2007-05-03 Cheetah Omni, Llc Packet-Based Digital Display System
US7429983B2 (en) 2005-11-01 2008-09-30 Cheetah Omni, Llc Packet-based digital display system
US8379061B2 (en) 2005-11-01 2013-02-19 Gopala Solutions Limited Liability Company Packet-based digital display system
US7505208B1 (en) 2006-02-06 2009-03-17 Raytheon Company Air-gap optical structure with a nonreflective air-gap spacer
WO2010096066A1 (en) * 2008-03-11 2010-08-26 Robe Lighting Inc An integrated multiple output luminaire
US9897901B2 (en) 2012-09-28 2018-02-20 Appotronics Corporation Limited Light source system and related projection system
EP2902844A4 (en) * 2012-09-28 2016-10-12 Appotronics China Corp Light source system and related projection system
US10197897B2 (en) * 2012-09-28 2019-02-05 Appotronics Corporation Limited Light source system employing two light emitting devices and related projection system employing two spatial light modulators
US10095095B2 (en) * 2012-09-28 2018-10-09 Appotronics Corporation Limited Light source system employing two light emitting devices and related projection system employing two spatial light modulators
US9897900B2 (en) * 2012-09-28 2018-02-20 Appotronics Corporation Limited Light source system and related projection system
US9897903B2 (en) * 2012-09-28 2018-02-20 Appotronics Corporation Limited Light source system and related projection system
US9746756B2 (en) 2012-09-28 2017-08-29 Appotronics China Corporation Light source system and related projection system employing a light division system and two spatial light modulatiors
US20170255088A1 (en) * 2012-09-28 2017-09-07 Appotronics China Corporation Light source system and related projection system
US20170255087A1 (en) * 2012-09-28 2017-09-07 Appotronics China Corporation Light source system and related projection system
US10228613B2 (en) * 2012-09-28 2019-03-12 Appotronics Corporation Limited Light source system and related projection system employing a light division system and two spatial light modulators
US20170255091A1 (en) * 2012-09-28 2017-09-07 Appotronics China Corporation Light source system and related projection system
US20170255092A1 (en) * 2012-09-28 2017-09-07 Appotronics China Corporation Light source system and related projection system
JP2015533225A (en) * 2012-09-28 2015-11-19 深▲ちぇん▼市繹立鋭光科技開発有限公司 Light source system and associated projection system
US20170255090A1 (en) * 2012-09-28 2017-09-07 Appotronics China Corporation Light source system and related projection system
EP3454117A1 (en) * 2012-09-28 2019-03-13 Appotronics Corporation Limited Light source system and related projection system
US9939719B2 (en) 2013-05-23 2018-04-10 Texas Instruments Incorporated Light modulator image display projector architectures
US9664989B2 (en) 2013-05-23 2017-05-30 Texas Instruments Incorporated Multi-spatial light modulator image display projector architectures using solid state light sources
US10110861B2 (en) 2014-04-02 2018-10-23 Appotronics Corporation Limited Light source system and projection system
US10230928B2 (en) * 2014-10-27 2019-03-12 Texas Instruments Incorporated Color recapture using polarization recovery in a color-field sequential display system
US20160119595A1 (en) * 2014-10-27 2016-04-28 Texas Instruments Incorporated Color Recapture using Polarization Recovery in a Color-Field Sequential Display System
US20180196335A1 (en) * 2015-07-17 2018-07-12 Nec Display Solutions, Ltd. Image display device and image display method
US10281805B2 (en) * 2015-07-17 2019-05-07 Nec Display Solutions, Ltd. Image display device and image display method
TWI584049B (en) * 2015-07-20 2017-05-21 深圳市光峰光電技術有限公司 Light combining control system
WO2017117035A1 (en) 2015-12-29 2017-07-06 3M Innovative Properties Company Additive manufacturing methods for adhesives and adhesive articles
TWI587066B (en) * 2016-07-05 2017-06-11 台達電子工業股份有限公司 Optical device
WO2018028236A1 (en) * 2016-08-06 2018-02-15 深圳市光峰光电技术有限公司 Display system and image modulation method
CN107688273A (en) * 2016-08-06 2018-02-13 深圳市光峰光电技术有限公司 Display system and image modulation method
CN107688273B (en) * 2016-08-06 2019-07-16 深圳光峰科技股份有限公司 Display system and image modulation method

Similar Documents

Publication Publication Date Title
US6811267B1 (en) Display system with nonvisible data projection
US6549338B1 (en) Bandpass filter to reduce thermal impact of dichroic light shift
US6480634B1 (en) Image projector including optical fiber which couples laser illumination to light modulator
EP1258148B1 (en) System and method employing led light sources for a projection display
US6802613B2 (en) Broad gamut color display apparatus using an electromechanical grating device
US5921650A (en) High efficiency field-sequential color projector using two SLMs
CN1033666C (en) Speckle-free display system using coherent light
US7147331B2 (en) Method of driving a spatial light modulator and projector
US6517210B2 (en) Shortened asymmetrical tunnel for spatially integrating light
US5389982A (en) Optical system for liquid crystal projector
US5448314A (en) Method and apparatus for sequential color imaging
US6807010B2 (en) Projection display apparatus having both incoherent and laser light sources
US6334685B1 (en) Segmented light pipe apparatus and method for increasing luminous efficiency of single light-valve, color video projection displays
US8469520B2 (en) Light source device and projection display apparatus
JP2004520631A (en) Projection display device
US6733139B2 (en) Projector with narrow-spectrum light source to complement broad-spectrum light source
EP1018842A2 (en) Video projector
EP0865210B1 (en) Colour-sequential video display system
US7088321B1 (en) Method and apparatus for driving LED light sources for a projection display
US7118225B2 (en) Illumination system
CN1087079C (en) Reflection type projector
AU2001274885B2 (en) Projection system utilizing fiber optic illumination
EP0812508B1 (en) Two lamp, single light valve projection system
US6398389B1 (en) Solid state light source augmentation for SLM display systems
US20030179346A1 (en) Lighting device and projection type display apparatus using the same

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12